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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c698f8559e380b5b4bef827f42c20ca6c5792428e4809f882a8a0ba4c94f8565' 
  AND token = 'fzdR31y5a2GJfllBQ2bnMcVN7tGTHJo9ZmUfy06l8KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}